Amazon.com: 10p to 6 Pins Isp Cable for arduino avr Programmer Cable Adapter : Electronics
Amazon.com: USB AVR Programmer w/ 6-Pin 10-Pin IDC ISP Connector for USBASP : Electronics
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For AVRISP USBASP STK500 10PIN To 6PIN ISP Adapter Board Programmer Electronic Module for Arduino Board - AliExpress
Amazon.com: Geekstory for ATMEL 51 AVR USB ISP ASP Microcontroller Programmer Downloader with Cable + 10Pin to 6Pin Adapter Board for Ender 3 or Ender 3 Pro : Electronics
Adafruit 6-pin AVR ISP Breadboard Adapter Mini Kit : ID 1465 : $0.95 : Adafruit Industries, Unique & fun DIY electronics and kits